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| Re: A15 Crankcase breather pipe/ catch can |
Subject: Re: A15 Crankcase breather pipe/ catch can
by lamb_daiquiri on 2013/1/7 8:28:49
As far as the law's concerned your car isn't roadworthy with the crank case venting to atmosphere like that.
The crank case breather connects on the engine side of the throttle plates and draws air through from the inlet on the rocker cover. It's usually fitted with a non-return valve (specifically the PCV valve) to prevent back flow if there's a backfire. The inlet on the rocker cover is either fitted with a filter or connected to the air cleaner. This system helps keep your oil and crank case dry as well as reducing emissions.
You can probably drill and tap some threads to fit some hose barbs into the manifold (ideally one per runner since you have 4 throttle plates). You'd need to plumb that up to the crank case breather. The carbs then need to be retuned for the extra air bleed, particularly the idle circuit. I'd imagine something that fits 1/4" fuel line to each runner would be about right. If it's too big you might need to fit some kind of throttle in the vacuum line that leads to the crank case.
At the very least connect the crank case pipe to something to stop the oil dripping out.
Hope that's helpful.
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